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		<title>three.js webgl - lines - cubes</title>
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			<a href="http://github.com/mrdoob/three.js" target="_blank">three.js</a> - lines WebGL demo
			[<a href="http://en.wikipedia.org/wiki/Hilbert_curve">Hilbert curve</a> thanks to <a href="http://www.openprocessing.org/visuals/?visualID=15599">Thomas Diewald</a>]
		</div>

		<script src="../build/Three.js"></script>

		<script src="js/Detector.js"></script>
		<script src="js/Stats.js"></script>

		<script>

			if ( ! Detector.webgl ) Detector.addGetWebGLMessage();

			var mouseX = 0, mouseY = 0,

			windowHalfX = window.innerWidth / 2,
			windowHalfY = window.innerHeight / 2,

			camera, scene, renderer;

			init();
			animate();

			function init() {

				var i, material, container;

				container = document.createElement( 'div' );
				document.body.appendChild( container );

				scene = new THREE.Scene();

				camera = new THREE.PerspectiveCamera( 33, window.innerWidth / window.innerHeight, 1, 10000 );
				camera.position.z = 700;
				scene.add( camera );

				renderer = new THREE.WebGLRenderer();
				renderer.setSize( window.innerWidth, window.innerHeight );
				container.appendChild( renderer.domElement );

				var geometry = new THREE.Geometry(),
					points = hilbert3D( new THREE.Vector3( 0,0,0 ), 200.0, 4, 0, 1, 2, 3, 4, 5, 6, 7 );

				for ( i = 0; i < points.length; i ++ ) {

					geometry.vertices.push( new THREE.Vertex( points[i] ) );

				}


				// lines

				var line, p, scale = 0.3, d = 125, c1 = 0x553300, c2 = 0x555555, c3 = 0x992800, g1 = geometry,
					m1 = new THREE.LineBasicMaterial( { color: c1, opacity: 1, blending: THREE.AdditiveBlending, transparent: true } ),
					m2 = new THREE.LineBasicMaterial( { color: c2, opacity: 1, blending: THREE.AdditiveBlending, transparent: true } ),
					m3 = new THREE.LineBasicMaterial( { color: c3, opacity: 1, blending: THREE.AdditiveBlending, transparent: true } ),
					parameters = [ [ m3, scale*0.5, [0,0,0],  g1 ], [ m2, scale*0.5, [d, 0, 0],  g1 ], [ m2, scale*0.5, [-d, 0, 0],  g1 ],
								   [ m2, scale*0.5, [0,d,0],  g1 ], [ m2, scale*0.5, [d, d, 0],  g1 ], [ m2, scale*0.5, [-d, d, 0],  g1 ],
								   [ m2, scale*0.5, [0,-d,0], g1 ], [ m2, scale*0.5, [d, -d, 0], g1 ], [ m2, scale*0.5, [-d, -d, 0], g1 ],

								   [ m1, scale*0.5, [2*d, 0, 0],  g1 ], [ m1, scale*0.5, [-2*d, 0, 0],  g1 ],
								   [ m1, scale*0.5, [2*d, d, 0],  g1 ], [ m1, scale*0.5, [-2*d, d, 0],  g1 ],
								   [ m1, scale*0.5, [2*d, -d, 0], g1 ], [ m1, scale*0.5, [-2*d, -d, 0], g1 ],
								   ];

				for ( i = 0; i < parameters.length; i ++ ) {

					p = parameters[ i ];

					line = new THREE.Line( p[ 3 ],  p[ 0 ] );

					line.scale.x = line.scale.y = line.scale.z =  p[ 1 ];

					line.position.x = p[ 2 ][ 0 ];
					line.position.y = p[ 2 ][ 1 ];
					line.position.z = p[ 2 ][ 2 ];

					scene.add( line );

				}

				document.addEventListener( 'mousemove', onDocumentMouseMove, false );
				document.addEventListener( 'touchstart', onDocumentTouchStart, false );
				document.addEventListener( 'touchmove', onDocumentTouchMove, false );

			}

			// port of Processing Java code by Thomas Diewald
			// http://www.openprocessing.org/visuals/?visualID=15599

			function hilbert3D( center, side, iterations, v0, v1, v2, v3, v4, v5, v6, v7 ) {

				var half = side/2,

					vec_s = [

					new THREE.Vector3( center.x - half, center.y + half, center.z - half ),
					new THREE.Vector3( center.x - half, center.y + half, center.z + half ),
					new THREE.Vector3( center.x - half, center.y - half, center.z + half ),
					new THREE.Vector3( center.x - half, center.y - half, center.z - half ),
					new THREE.Vector3( center.x + half, center.y - half, center.z - half ),
					new THREE.Vector3( center.x + half, center.y - half, center.z + half ),
					new THREE.Vector3( center.x + half, center.y + half, center.z + half ),
					new THREE.Vector3( center.x + half, center.y + half, center.z - half )

					],

					vec = [ vec_s[ v0 ], vec_s[ v1 ], vec_s[ v2 ], vec_s[ v3 ], vec_s[ v4 ], vec_s[ v5 ], vec_s[ v6 ], vec_s[ v7 ] ];

				if( --iterations >= 0 ) {

					var tmp = [];

					Array.prototype.push.apply( tmp, hilbert3D ( vec[ 0 ], half, iterations, v0, v3, v4, v7, v6, v5, v2, v1 ) );
					Array.prototype.push.apply( tmp, hilbert3D ( vec[ 1 ], half, iterations, v0, v7, v6, v1, v2, v5, v4, v3 ) );
					Array.prototype.push.apply( tmp, hilbert3D ( vec[ 2 ], half, iterations, v0, v7, v6, v1, v2, v5, v4, v3 ) );
					Array.prototype.push.apply( tmp, hilbert3D ( vec[ 3 ], half, iterations, v2, v3, v0, v1, v6, v7, v4, v5 ) );
					Array.prototype.push.apply( tmp, hilbert3D ( vec[ 4 ], half, iterations, v2, v3, v0, v1, v6, v7, v4, v5 ) );
					Array.prototype.push.apply( tmp, hilbert3D ( vec[ 5 ], half, iterations, v4, v3, v2, v5, v6, v1, v0, v7 ) );
					Array.prototype.push.apply( tmp, hilbert3D ( vec[ 6 ], half, iterations, v4, v3, v2, v5, v6, v1, v0, v7 ) );
					Array.prototype.push.apply( tmp, hilbert3D ( vec[ 7 ], half, iterations, v6, v5, v2, v1, v0, v3, v4, v7 ) );

					return tmp;

				}

				return vec;
			}

			//

			function onDocumentMouseMove(event) {

				mouseX = event.clientX - windowHalfX;
				mouseY = event.clientY - windowHalfY;
			}

			function onDocumentTouchStart( event ) {

				if ( event.touches.length > 1 ) {

					event.preventDefault();

					mouseX = event.touches[ 0 ].pageX - windowHalfX;
					mouseY = event.touches[ 0 ].pageY - windowHalfY;
				}
			}

			function onDocumentTouchMove( event ) {

				if ( event.touches.length == 1 ) {

					event.preventDefault();

					mouseX = event.touches[ 0 ].pageX - windowHalfX;
					mouseY = event.touches[ 0 ].pageY - windowHalfY;
				}
			}

			//

			function animate() {

				requestAnimationFrame( animate );

				render();

			}

			function render() {

				camera.position.x += ( mouseX - camera.position.x ) * .05;
				camera.position.y += ( - mouseY + 200 - camera.position.y ) * .05;

				camera.lookAt( scene.position );

				var time = Date.now() * 0.0015;

				for ( var i = 0; i < scene.children.length; i ++ ) {

					var object = scene.children[ i ];
					if ( object instanceof THREE.Line ) object.rotation.y = time * ( i % 2 ? 1 : -1 );

				}

				renderer.render( scene, camera );

			}

		</script>
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